xref: /openbmc/linux/arch/sh/mm/nommu.c (revision bb3982b4) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * arch/sh/mm/nommu.c
4  *
5  * Various helper routines and stubs for MMUless SH.
6  *
7  * Copyright (C) 2002 - 2009 Paul Mundt
8  */
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/string.h>
12 #include <linux/mm.h>
13 #include <asm/pgtable.h>
14 #include <asm/tlbflush.h>
15 #include <asm/page.h>
16 #include <linux/uaccess.h>
17 
18 /*
19  * Nothing too terribly exciting here ..
20  */
21 void copy_page(void *to, void *from)
22 {
23 	memcpy(to, from, PAGE_SIZE);
24 }
25 
26 __kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n)
27 {
28 	memcpy(to, from, n);
29 	return 0;
30 }
31 
32 __kernel_size_t __clear_user(void *to, __kernel_size_t n)
33 {
34 	memset(to, 0, n);
35 	return 0;
36 }
37 
38 void local_flush_tlb_all(void)
39 {
40 	BUG();
41 }
42 
43 void local_flush_tlb_mm(struct mm_struct *mm)
44 {
45 	BUG();
46 }
47 
48 void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
49 			    unsigned long end)
50 {
51 	BUG();
52 }
53 
54 void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
55 {
56 	BUG();
57 }
58 
59 void local_flush_tlb_one(unsigned long asid, unsigned long page)
60 {
61 	BUG();
62 }
63 
64 void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
65 {
66 	BUG();
67 }
68 
69 void __flush_tlb_global(void)
70 {
71 }
72 
73 void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
74 {
75 }
76 
77 void __init kmap_coherent_init(void)
78 {
79 }
80 
81 void *kmap_coherent(struct page *page, unsigned long addr)
82 {
83 	BUG();
84 	return NULL;
85 }
86 
87 void kunmap_coherent(void *kvaddr)
88 {
89 	BUG();
90 }
91 
92 void __init page_table_range_init(unsigned long start, unsigned long end,
93 				  pgd_t *pgd_base)
94 {
95 }
96 
97 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
98 {
99 }
100 
101 void pgtable_cache_init(void)
102 {
103 }
104